Three more teenage suspects have been arrested in connection with a July 16 marijuana heist that turned deadly.

Martell Williams, Stanley Williams and Troy Ward, all 18, were arrested this week in connection with a robbery that left three people dead in the 7800 block of Somerset Bay.

"I smoked all three of them," a witness remembered Ward saying, according to a probable cause affidavit.

Martell Williams and Ward face a host of charges, including murder, robbery resulting in serious bodily injury and carrying a handgun without a license. Williams and a previously arrested suspect, 18-year-old Devante Gilbert, face three counts of robbery resulting in bodily injury.

Prosecutors also are pursuing charges against a 15-year-old in juvenile court.

A probable cause affidavit released Thursday alleges Ward was the trigger man in the robbery that left Dominique Miller, 25; Jordan Wright, 25; and Justin Crowder, 19, dead in a north-side apartment.

The affidavit details how the five suspects planned a robbery of Crowder, who witnesses told police was a known marijuana dealer. Stanley Williams and Gilbert stayed behind in the car, while Martell Williams, Ward and the 15-year-old suspect went inside to retrieve a safe from Crowder's room, the affidavit says.

Wright was found lying in a hallway on top of a samurai sword, court documents say. Crowder was found near Wright and Miller was found in one of the apartment's bedrooms. Each was found to have a gunshot wound to the head and chest.

Witnesses who were hiding in the apartment at the time of the robbery detailed the crime to police. One woman said Wright told her to stay hidden in his bedroom and grabbed the samurai sword after the men entered the apartment, according to the affidavit. That was the last time she saw him alive.

Another woman told police she hid under the covers when she heard gunshots and was in the bedroom when two men entered the room and killed Miller, according to the affidavit.

After the shooting, a witness told police the three suspects ran from the apartment, toting a safe.

"I'm a murderer," a witness remembered Ward yelling out, according to the affidavit.

Ward and Stanley Williams are expected to make their initial appearances in Marion Superior Court on Monday. Online court records indicate Gilbert is scheduled for a jury trial Dec. 18 and Martell Williams is scheduled for a trial in January.